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HTML5 Developer’s Cookbook: Grouping, Text-level and Re-defined Semantics

Aug 10, 2011

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HTML5 Developer's Cookbook

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Beginner Recipe: Tracking the Completion of a Task with the <progress> Element

The new progress element is for tracking the status and completion of a task. It could be used to display the progress of a download – downloading a file, or loading in data from an AJAX call for example.

There are two optional attributes for the progress element: value and max.

Value

The value attributes represents how much of the task has been completed.

Max

The max attribute represents the total amount required to complete the task. Both the value and max contents should be displayed inside the progress element so the user has feedback on the completion state.

<p>You are downloading a very important file, please wait.</p>
<progress value="45" max="100"><span>45</span>% complete</progress>

In Chrome the above code would give you the screenshot in Figure 2.5 (the progress bar also glows as well, which is a nice little touch):

Figure 2.5 The progress element in Chrome

In browsers with less support for progress, you get the result in Figure 2.7 (screenshot from Firefox 3.6)

Figure 2.6 The fallback display for browsers that do not support the progress element

The idea behind this is that the green bar, or the text visual, would update live so the user knows exactly what is going on.

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